Clamping device



y 12, 1942- G. H. FUEHRER 7 2,282,757-

CLAMPAING DEVICE Filed Jan. 15, 1941 IN V E NTOR eye IiFuekaen Hus ATTORNEY.

Patented May 12, 1942 UNITED STATES PATENT Qo FICEN CLAMPING DEVICE.

George H. Fuehrer, Phillipsburg, N. J.,' assignor to Ingersoll-Rand Company, New York, N. Y., a corporation of New Jersey I Application January 15, 1941, Serial No. 374,437

4 Claims.

This invention relates to clamping devices, and more particularly to a clamping device for securing a rock drilling mechanism to a Support, as for example a column or a quarry'bar.

One object of the invention is to enable the drilling mechanism to be conveniently and expeditiously shifted on the support to a desired position with respect to the work.

Another object is to assure an interlocking connection between the drilling mechanism and the clamping device so that when the clamping pressure is released for adjusting the drilling mechanism, the drilling mechanism will remain securely interlocked with the clamping device.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference numerals refer to similar parts,

Figure 1 is a side view of a drilling mechanism and a support connected together by a clamping device constructed in accordance with the practice of the invention,

Figures 2 and 3 are transverse views taken through Figure 1 on the lines 2-2 and 3-3, respectively, and

Figure 4 is a perspective view of the clamping device.

Referring more particularly to the drawing,

' tionship with the work 22'.

The rock drilling mechanism is shown as being of a well known type comprising a rock drill 23, as for example of the fluid actuated percussive type, adapted to deliver blows to a working implement 24 extending into the front end of the rock drill.

On the exterior of the casing of the rock drill and on opposite sides thereof are ribs 25 that extend slidably into guideways 26 of a shell 21, and a feed screw 28, journaled at its ends in the shell 21 and having a handle 29 for rotating it, is threadedly connected to the rock drill in a well known manner for sliding the rock drill along the shell,

In the form of construction shown, the shell 2''! is also slidable relatively to the column 2| and, to this end, is provided with a pair of guide ribs 30 extending longitudinally along the outer surface thereof and terminating near stop members 3| depending from the bottom of the shell. The guide ribs 30 constitute integral portions of an arcuate plate 32 secured to the bottom of the shell, as for example by Welding 33. They' are inclined in opposite directions and are adapted to seat slidably upon inclined surfaces 34' extending along opposite sides of a body 35, said body having a frusto conical flange 36 adapted to be gripped by a clamping mechanism 31 of well known construction secured to the column 2| or, more specifically, to an arm 38 extending laterally of the column 2|;

On the opposite sides of the body 35 are clamps.

39, in the form of plates, each having an upper inclined surface 49 and a lower inclined surface.

4| to seat, respectively, against the outer surface 42 of a guide rib 30 and against an inclined surface 43 extending along the side of the body 35 and being oppositely inclined to the surface 34 on the same side of the body.

Intermediate the ends of the clamps 39 and between the surfaces 40 and 4| are apertures 44 to accommodate the outer portions 45 of a rod 46 having threaded ends 41 upon which are threaded nuts 48 that act against the outer surfaces of the clamps for pressing said clamps firmly against the guide ribs 30 and the inclined surfaces 43. The rod 46 may be held against rotary movement with respect to the body in any suitable manner, as for example by forming the intermediate portion 49 of the rod of polygonal shape and an aperture 59 in the body 35, through which the rod extends, of like shape so that the rod will be restrained against rotating during the threading and unthreading of the nuts 48. Preferably washers 5| are interposed between the nuts 48 and the clamps 39.

To the end that the shell 21 will at all times be interlockin gly connected with the clamping device even though the nuts 48 are backed-01f to relieve clamping pressure upon the guide ribs 30 each clamp 39 is provided, at its ends, with integral extensions 52 having guideways 53 to slidably receive the guide ribs 30. The guideways 53 are of ample width so that the guide ribs 30 may slide readily therethrough. The outer .surfaces of the guideways 53 are continuations of the surfaces 40 and the inner surfaces 54 of the guide- ,ways 53 are so spaced with respect to the surfaces 40 that when the clamps are in the correct clamping position said surfaces 54 will lie inside of the planes of the surfaces 34. The inner surfaces of the guide ribs 30 will then seat only against the surfaces 34.

In order that the clamps 39 may be restrained against any tendency to rotate about the rod 46 the surfaces 55 of the extensions adjacent the inner ends of the surfaces 54 preferably lie closely to the end surfaces 56 of the body 35. Suflicient clearance should exist between the two to enable the clamps to move readily laterally of the body but the clearance should not be of such extent that the clamps may rotate through a considerable arc beforethe surfaces 55 engage the surface 56 of the body. I

In practice, whenever it is desired to shift the shell 21- with respect to the clamps 39 one or both of the nuts 48 are backed-off on the rod 46 to relieve the clamping pressure upon the guide ribs 30. The drilling mechanism, including the shell 21, may then be moved forwardly or rearwardly as desired and when the shell'has been adjusted to the correct position the nuts 48 are again tightened to clamp the guide ribs 30'immovably to the body 35. This adjustment, as will be readily appreciated, may be made with a minimum loss of time and without danger of the drilling mechanism becoming accidentally detached from the clamping device since the guide ribs 30 will at all times be interlockingly connected with the clamps 39.

I claim:

1. A clamping device for a rock drilling mechanism having longitudinally extending guide ribs, comprising a body having seating surfaces for the guide ribs, clamps for clamping the guide ribs to the seating surfaces, and means onthe clamps extending into the longitudinal plane of the body and cooperating. with'the body to prevent the clamps from rotating with respect to the body.

. 2. A clamping device for a rock drilling mechanism having longitudinally extending guide ribs, comprising a body having seating surfaces for the guide ribs, clamps extending along the seating surfaces for clamping the guide ribs thereto, extensions on the ends of the clamps having guideways for the guide ribs, and means on the extensions and the body cooperating with each other to prevent the clamps from rotating with respect to the body.

3. A clamping device for a rock drilling mechanism having relatively inclined longitudinally extending guide ribs, comprising a body having in- .clined seating surfaces for the guide ribs, clamps 2 extending along the seating surfaces for clamping the guide ribs-thereto, extensions on the ends of. the clampshaving inclined guideways for the guide ribs, abutments on the body, and means on the extensions cooperating with the abutments toprevent rotary movement of the clamps with respect to the. body.

4. A clamping device for a rock'drilling mechanism having longitudinally extending guide ribs, comprising a body having seating surfaces for the guide ribs, clamps for clamping thev guide ribs to the seating surfaces, extensions on the clamps having guideways for the guide ribs, actuator means for the clamps extending through the clamps to connect the clamps to the body, and means on the extensions and the body cooperating with each other to prevent the clamps from rotating with respect to. the actuator means.

' GEORGE H. FUEHRER. 

